US3406266A - Timed switch-control device - Google Patents

Timed switch-control device Download PDF

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Publication number
US3406266A
US3406266A US620478A US62047867A US3406266A US 3406266 A US3406266 A US 3406266A US 620478 A US620478 A US 620478A US 62047867 A US62047867 A US 62047867A US 3406266 A US3406266 A US 3406266A
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US
United States
Prior art keywords
button
push
diaphragm
contact
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US620478A
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English (en)
Inventor
Herve Raymond
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
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Publication of US3406266A publication Critical patent/US3406266A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H01H43/24—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a non-rotatable moving part
    • H01H43/28—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a non-rotatable moving part the actuation being produced by a part, the speed of which is controlled by fluid-pressure means, e.g. by piston and cylinder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/86—Means for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts
    • H01H50/88—Mechanical means, e.g. dash-pot

Definitions

  • the air throttle may consist of a needle valve or a passage containing compacted fibrous material.
  • the air throttle might be constituted by a valve having two flat discs resiliently urged into contact with one another, and one of which discs possesses on that of its faces opposite the other a fine groove which is closed off by the other disc.
  • the other disc has apertures which communicate with the passage thus formed, so that, in accordance with the relative position of the discs, a greater or lesser length of the groove is utilised.
  • the contactoperating element is directly connected to the diaphragm and the timer chamber communicates on the one hand through the valve and on the'other through the capillary passage (or other air throttling device), directly with the atmosphere.
  • Devices are also known in which the diaphragm separ-ates two virtually closed chambers, air flowing from one to the other in one direction through a central valve of the diaphragm and in the other through a capillary passage.
  • a device of this form which, in efliect, uses air in closed circuit is advantageous from the point of view of functional reliability.
  • a timed switch control device in which the air throttle is situated laterally in relation to the diaphragm and communicates with the chambers through passages which are radially disposed in relation to the diaphragm.
  • the present invention relates to a timed switch control device, with a timer chamber in simple design and great reliability.
  • the body of the I timer device is a moulded component which has a cavity closed off by a diaphragm and constituting the timer chamher, and two further cavities, the second of which at least partially envelopes the first, the first of the two further cavities being closed off by a filter and the second by a sealed wall, the timer chamber and the first of the further cavities communicating with one another through the medium of an air throttle and passages formed in the moulded component, whilst the second of the further cavities communicates through narrow passages, likewise formed in the moulded component, with the space located at the external side of the diaphragm.
  • this latter space is a compartment containing the contacts themselves, which compartment communicates with the atmosphere through a narrow passage.
  • the air throttle will, advantageously, be a disc valve arrangement, the seating for which is created in one face of the moulded component, normal to the diaphragm, the passages linking this valve with the timer chamber and with the first cavity, being disposed radially in relation to the centre of the diaphragm, in the moulded component.
  • the contact compartment constitutes, together with the two further cavities in the switch casing, a second chamber associated with the timer chamber, in which the air passing from one to the other circulates in a virtually closed circuit.
  • the contact operating element is a slidable push-button associated with a frame which serves as a contact bridge in conjunction with springs whose central position, corresponding to the maximum deflection of the spring, is unstable so that even when the movement of the push-button is slow, the movement of the contact bridge is rapid.
  • this externally-operated push-button will be enclosed and guided between a base and a cover which, when assembled together, form between them the contact chamber, the base supporting the body of the timer device and the fixed contacts, and the cover trapped between the assembly of base and body, preferably being transparent in order to enable the contacts to be inspected.
  • the base will preferably be in the form of a bracket so that it can be attached to a side face of an electromagnetic relay provided with a contact operating strip which is movable perpendicularly in relation to the side face (i.e. parallel to the mounting panel of the relay) in order to be able to operate the push-button during one or other of its reciprocating movements.
  • FIGURE 1 is a side elevation of a timed contact device embodying the invention
  • FIGURE 2 is an end elevation
  • FIGURE 3 is an axial section through the device
  • FIGURE 4 is a perspective view of the push-button
  • FIGURE 5 is an end elevation of the device, partially cut away, from the end opposite to that of FIGURE 2,
  • FIGURE 6 is a view in the direction indicated by VIVI in FIGURE 1, and
  • FIGURE 7 is a perspective view of the cover of the compartment containing electric contacts, the cover being s'hown'tipside down. i a V axially, this push-button having, as FIGURE 1 shows, a
  • the cover is, advantageously, made of a transparent material.
  • the base A and the body B are assembled together by means of three bolts 60 the heads and shanks of which are contained in passages 61 (FIGURE produced during moulding of the timer body B.
  • the cover D has a shoulder 62 which, when the cover has been assembled on the base A, is underneath the top face of the timer body B so that the cover cannot be released and is attached in sealed fashion at its edges, to the base A.
  • a device embodying the invention is designed to be associated with any kind of mechanism capable of applying a pressure to the tip E in order to trigger the switch timer system.
  • the device may be attached to one of the ends of an electromagnetic relay F such as described for example in the specifications mentioned above.
  • a relay of this kind has a contact-carrying strip G, schematically illustrated in FIGURE 1, which is capable of reciprocation parallel to the mounting panel to which the relay is attached (this is indicated by the doubleheaded arrow H), and this strip cooperated with the tip E of the push-button.
  • the device is held in place against the relay F by the dowel portions 2a on the face 2 of the base A, these dowel portions engaging grooves in the side faces of the relay F, and by the bolts 1 associated with the mating flanges of relay F and base A. Since the apparatus illustrated in the figures can be attached at either end of the relay F, the strip G can cooperate with the push-button A either in the rest state or in the working state, so that the set-up can be arranged to provide timed contact operation either on opening or on closing of the relay contacts.
  • the push-button E has a cruciform transverse cross-section. It is guided in a T-section groove 3 in the base A, the T-section being completed by a portion 4 (see also FIGURE 7) of the cover D, to from a complete cross.
  • This portion 4 comprises two pillars 4a against which abut the faces 5 of the push-button E, whilst shoulders 6 of the push-button are guided between the pillars 7 which are also integral with the cover D.
  • two mutually opposite recesses 8 are formed into which there extend the ends of springs 9 of S-shape, which are responsible for the movement of a frame 10 provided on each of its faces with contacts 11 which move between pairs of fixed contacts 12 integral with screw terminals 13 by which the apparatus is externally connected into circuit.
  • the terminals 13 are fixed to the base A between the moulded flanges 36 thereof.
  • a contact device constituted by a push-button passing through a frame acting as a contact bridge, the connection between frame and push-button being effected through S-shaped springs, is known per se. It is known that the springs 9 are unstable at their point of maximum deflection. Thus, when the push-button E is displaced in one direction or the other, the frame remains in contact with a pair of fixed contacts until the springs reach their maximum deflection but as soon as the position of the push-button corresponding to maximum deflection is passed the frame 10 moves rapidly in the opposite direction to the push-button, thus passing from one pair of fixed contacts to the other.
  • the internal end E of the push-button also of cruciform cross-section, is enlarged and rests" a'gainsf'aflat thrust plate 14 integral with a rod 15 of a valve 16.
  • the thrust plate 14 acts on a stiffened central portion 18a of a diaphragm 18, whose periphery 18b is sealed to the edge of a cavity in the timer body B.
  • the valve 16 and the diaphragm 1 8 are biased into rest positions by a spring '19 whilst the spring 17 acts in the opposite sense to urge the diaphragm 18'and a seating thereon against the valve when the pushbutton 'E is not operated.
  • the spring 19 is carried on a screw 20 which can be used toadjust the degree of compression, the screw engaging, through a sealing arrangement, the centre of a hollow conical boss 21 on the timer bodyB. This boss,attached to a, wall 22 of the body, forms in conjunction with the diaphragm 18 the timer chamber 23.
  • the central boss 21 is surrounded by a circularwall 26, moulded in situ within the body B, which wall defines in the body, at the side opposite to the diaphragm, two cavities, the first of which is central and is surrounded by the other.
  • the wall 26 contains along its free edge, a groove in which there is located an air filter 28 associated with a seal 27. The central cavity closed off by the filter, thus forms a compartment 29.
  • the external cavity of the body B is closed off at the back, in sealed fashion, by a plate 30 which is held in place by rivets 31 (FIGURE 5) projecting from the moulded flanges and, like the passages 61, the external cavity is formed in situ within the body B.
  • plate 30 At its centre, plate 30 has a boss 32 of the resilient material which holds the filter 28 in position.
  • the external cavity thus formed by.the plate 30 forms a compartment 33 which communicates with the compartment containing the contacts through two small passages 34.
  • FIGURE 7 shows, having hollow elements 35 which enclose two central flanges 36 (FIGURE 1) separating the contact terminals 13.
  • the top face of the body B contains arecess 37 inwhich there are situated a rubber seal 38 and a disc 39, both being prevented from turning by the pips 40 on the edge of the recess.
  • the seal 38 and the disc 39 contain apertures 41 and 42 corresponding in position with those open ends 24a and 25a of the passages 24, 25.
  • the aperture 42 extends on the top face of the disc 39 into a radial groove 43 which leads to a circular undercut 44 in the disc.
  • the aperture 41 extends towards the exterior, in the form of an elongated groove 45.
  • a second disc 47 On top of the disc 39, there is applied through the medium of a second sealing arrangement 46, a second disc 47 which on that of its faces in contact with the disc 39, has a radial groove 48the external end of which extends into a fine circular groove 49 which intersects the elongated recess 45.
  • the discs 39 and 47 are of a plastic material and are accurately moulded and polished so that they can be placed in intimate contact with one another to provide ' ⁇ an airtight seal.
  • the assembly constituted by the disc valve arrangement is enclosed in the recess formed in the underside of a knob 52 and compressed by the dished spring washer 50 with which there co-operates the screw 51, this screw passing through the button and engaging in the body B.
  • a top recess in the knob, in which there is lodged the head of the screw 51, is closed by a cover 53 press-fitted into place, this cover carrying markings which indicate the delay time.
  • the valve 16 closes (this as soon as the chamber 23 has emptied) so that the diaphragm 18 tends, under the action of the spring 19, to return to its original position and therefore the air pressure in space 23 drops.
  • air is drawn through passage 25, the circular groove 44 acing as collector, the radial groove 48, a certain length of the groove 49, the recess 45 and the passage 24, in order to restore to normal the air pressure in the chamber 23.
  • This movement of air is the slower the longer the length of groove 49 included in the above path.
  • the air which enters the passage 25, is drawn from the contact compartment, through the small passages 34, the compartment 33, the filter 28 and then the compartment 29. In effect, therefore, it is virtually the same air which was expelled from the timer chamber which ultimately returns to it and the device thus virtually operates in closed circuit fashion.
  • the diaphragm picks up the thrust plate 14 which in turn returns the push-button E to its original position.
  • the push-button E When the device is associated with a relay, as illustrated in FIGURE 1, the push-button E is normally depressed and a single pair of the terminals 13 is used all in accordance with whether it is desired to have timed opening or timed closing of the contacts.
  • the time delay depends upon the viscosity of the air and, consequently, upon ambient temperature so that the most that can be done is to graduate the apparatus in markings (indicated on the plate 53 opposite an index carried by the cover D) such as a succession of letters of the alphabet, which suggest a change in the delayed time without in any way attempting to indicate the actual delay time.
  • markings indicated on the plate 53 opposite an index carried by the cover D
  • a zero indication can be added, corresponding to the setting of the button 52 to a position in which the radial groove 48 is directly in communication with the annular collector 42 and the recess 45.
  • the delay is negliible.
  • An improved switch-control device having a timer chamber which is closed by a diaphragm associated with a contact operating element and which communicates with an external space through an air throttle situated laterally in relation to the diaphragm
  • the improvement comprises a moulded body component having a timer chamber closed 011 by the diaphragm, two further cavities of which the second at least partially envelopes the first, the first closed ofi by a filter and the second by a sealed wall, the timer chamber and the said first cavity communicating with one another via an air throttle and passages in the moulded component, whilst the second cavity communicates through a passage also created in the moulded component with a space located outside the timer chamber.
  • a device as claimed in claim 1 wherein the air throttle comprises in combination a disc valve arrangement, the seating for which is formed in a face of the moulded component which is perpendicular to the diaphragm, the said passages being disposed in said moulded component radially with respect to the centre of the said diaphragm.
  • a device as claimed in claim 2 wherein the compartment containing the contacts comprises in combination a base to which there are attached the body and the fixed contacts, and a cover, the assembly of body and base trapping the cover in place.
  • a device as claimed in claim 4 wherein the pushbutton is of a cruciform transverse cross-section.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Air-Flow Control Members (AREA)
  • Push-Button Switches (AREA)
  • Tumbler Switches (AREA)
  • Servomotors (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
US620478A 1966-03-11 1967-03-03 Timed switch-control device Expired - Lifetime US3406266A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR53142A FR1483795A (fr) 1966-03-11 1966-03-11 Dispositif temporisé de commande de contacts

Publications (1)

Publication Number Publication Date
US3406266A true US3406266A (en) 1968-10-15

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Application Number Title Priority Date Filing Date
US620478A Expired - Lifetime US3406266A (en) 1966-03-11 1967-03-03 Timed switch-control device

Country Status (6)

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US (1) US3406266A (pm)
BE (1) BE694920A (pm)
ES (1) ES337850A1 (pm)
FR (1) FR1483795A (pm)
GB (1) GB1126640A (pm)
SE (1) SE345927B (pm)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3912247A (en) * 1974-01-02 1975-10-14 Potter Electric Signal Pneumatic retard having stroke-accelerating valve

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2124123B1 (pm) * 1971-02-08 1975-07-04 Telemecanique Electrique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153706A (en) * 1960-11-19 1964-10-20 Telemcanique Electr Pneumatically-timed contact-holder
US3213237A (en) * 1962-02-21 1965-10-19 Westinghouse Electric Corp Time delay control device
US3213333A (en) * 1963-06-28 1965-10-19 Westinghouse Electric Corp Time delay control device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153706A (en) * 1960-11-19 1964-10-20 Telemcanique Electr Pneumatically-timed contact-holder
US3213237A (en) * 1962-02-21 1965-10-19 Westinghouse Electric Corp Time delay control device
US3213333A (en) * 1963-06-28 1965-10-19 Westinghouse Electric Corp Time delay control device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3912247A (en) * 1974-01-02 1975-10-14 Potter Electric Signal Pneumatic retard having stroke-accelerating valve

Also Published As

Publication number Publication date
ES337850A1 (es) 1968-03-16
SE345927B (pm) 1972-06-12
GB1126640A (en) 1968-09-11
BE694920A (pm) 1967-08-14
FR1483795A (fr) 1967-06-09

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